Car bolster and method of making same



c. E. BAUER. CAR BOLSTER AND METHOD OF MAKING SAME.

APPLICATION FILED MAY 28, I920.

Patented June 13, 1922.

" X t e ALA! c CARI.- E. BAUER, 0F HAMMOND, INDIANA, ASSIGNOR TO AHIERICAN STEEL FOUND- RIES, OF CHICAGO, ILLINOIS, A CORPQZ-LATION OF NEW JERSEY.

GAR BOLSTEB AND METHGD O31" MAKING SAME.

intense.

Application filed May 28,

To of], whom may concern:

Be it known that I, CARL Fl. BAUER, a citizen of the United fitates, residing at Hammond, in the county of Lake and State of Indiana, have invented certain new and useful Improvements in Car Bolsters and Methods of li laking Same, of which the following is a specification.

This invention relates to a car method of making same.

One object of the invention is to provide a truck bolster in which the tension and compression members are connected at their ends in a simple, neat and efficient manner to form a rigid connection in which all strains will be properly distributed and overcome.

Another object is to provide asimple and efficient method for connecting the ends of tension and compression members of a car bolster.

These and other objects are accomplished by means of the arrangements disclosed on the accompanying sheets f drawings, in which Figure 1 is a vertical sectional view of a bolster embodying my invention;

Figure 2 is a fragmentary top plan view showing the tension member wrapped around the end of the web of the compression member and expanded over the flanges of the latter;

Figure 3 is a view showing the ends of the tension and compression members gripped in dies with the end of the tension member extending beyond the end of the compression member prior to the time that the plunger forces the end of the tension member around the compression member into the space or cavity within the dies;

Figure l is a top view of the same arrangement shown in Figure 3;

Figure 5 is an end view of the same; and,

Figure 6 is a view similar to that shown in Figure 3 but after the upsetting and connecting operation has been completed.

The various novel features of my inven tion will be apparent from the following description and drawings and will be particularly pointed out in the appended claims.

Referring first to Figures 1 and 2 of the drawings, it will be noted that the car bolster includes a compression member 10, ten sion. member 11 and strut 12 extending between the two at the middle thereof, there being a truck center bearing 13 connected to bolster and Specification of Letters Patent. Pafmn bgd J n 13 1922 1926. Serial No. 384,852.

the center of the compression member, and side bearings 1 1 connected to the compression member adjacent the ends of the bolster. Preferably the compression member is of commercial channel section and the tension member 11 a rolled metal plate. This invention primarily relates to the connection between the ends of the tension and compression members and the method of forming said connection.

in order to bring the meeting point of the lines of force nearer to the center of the bolster, each end of the compression member bent so that it and the tension member will meet at a point approximately just over the place of support which is generally in a vertical line through the center of the arch bar instead of at the extreme end of the compression member After the end of the compression member is thus bent, as

shown in Figures 1 and 2, the tension and.

compression members as a unit are placed into a furnace for the purpose, primarily, of heating the extended end 15 of the tension member. It may be that the compression member will be heated to a certain extent. but preferably the tension member is heated to the extent that its metal will. readily flow when subjected to pressure. After the desired heat is obtained, the ends of the tension and compression members are placed within the stationary gripping die 16 and a movable gripping die 1.7. the latter f which is provided with a cavity 18 located over the web 19 of the compression member and which preferably extends completely across said web for a reason. to appear hereinafter. A temporary wedge 20 preferably is inserted between the web of the compression member and the tension member. After the dies have properly gripped the ends of the tension and compression members, as shown particularly in Figure 3 of the drawings, the plunger 21 is caused to move inwardly with respect to the dies and engages the extended end 15 of the tension member, forcing the metal thereof to flow around the end of the web of the compression member and into the cavity 18 to completely fill same, as shown in Figure 6. In so doing not only does the overlapping end of the tension member 15 engage the middle of the web 19 interme diate the flanges of the compression member. but it also extends completely over the entire width of the web, including those and portions'directly overlying the flanges of the compression member, thus providing a greater bearing surface and giving greater rigidity and strength to the connection, overcoming the tendency for that portion ot the 'Web intermediate the flanges to shear under strains developed under service conditions. Upon cooling, the tension member Will shrink a given amount, making its connection to the compression member more rigid, forming a positive lock between the parts in question. By connecting the ends of the tension and compression members, all irregularities are eliminated and a neat joint is formed pii'oviding substantially a solid or rigid construction. Each end of the bolster is then provided. with the usual end casting 22, the temporary Wedge 20 having been removed and a permanent Wedge or supporting member 23 having been substituted therefor.

It is apparent that there may be various modifications in the connection between the tension and compression members and the method of forming same, and it is my intention t cover all such modifications falling Within the spirit and scope of the following claims.

I claim:

1. A car bolster including a tension member and a compression member, the latter being of channel section and the former in the form of a plate,'the end of Which lies Within the channel, is lapped around the end thereof and is provided With laterally ex tending portions overlying the flanges of the compression member for increasing the strength of the connection.

2. A car bolster including a tension member and a compression member, the latter hem of channel section and the former in the form of a plate, the end of which lies Within the channel and is heated and shrunk around the end thereof for forming a rigid connection therewith.

3. A car bolster including a tension member and a compression member, the end of one being heated and shrunk around the end of the other for forming a rigid connection therebetween. 1

4. A car bolster including a tension member and a compression member, the latter being of channel section and the former being in the form of a plate, the end of which lies Within the channel, is shrunk around the end thereof and has laterally extending por tions for covering the entire Width of the Web of the compression member at the end of same.

5. The method of connecting the ends of the tension and compression members of a truss forming a car bolster consisting in confining the heated ends of said members Within dies With the end of the tension member extending beyond the end of the compres sion member and subjecting the end of the tension member to pressure and causing it to form around the end of the compression member.

6. The method of connecting the ends of the tension and compression members of a truss forming a car bolster consistingin confining the heated ends of said members Within dies with the end of the tension member extending beyond the end of the compression member and subjecting the end of the tension member to pressure and causing it to form around the end of the compression member, and expanding the end of the tension member laterally for increasing the engaging surfaces of said members.

'7. The method of connecting the ends of a channel shaped compression member and a bar tension member consisting in heating the tension member, placing said tension and compression members in dies, and causing the end of the tension member to Wrap around the end of the compression member for forming a ri id connection therebetiveen.

8. The methoc of connecting the ends of a channel shaped compression member and a bar tension member consisting in heating the tension member, placing said tension and compression members in dies, causing the end of the tension member to Wrap around the end of the compression member, and ex pending the ends of the tension member to extend over the full Width of the Web of the compression member for forming a rigid connection between said tension and com pression members.

Signed at Chicago, Illinois, this 22nd day of May, 1920.

CARL E. BAUER. 

